Here's my thoughts on Hunter 2v2. Now I don't know if this is widely regarded as fact, but this has been my experience.
Hunters need a dual DPS team. Why? Because that's the only way that hunters can fight a melee + healer team. They need to burn one down quick. Even with the post-patch buffs, a hunter cannot utilize his max DPS if he has someone in his face, bashing away.
You can say "kite him noob," but it's next to impossible to kite melee if they have a pocket healer. Simply put, you're not doing 100% of your damage while kiting a melee class.
Hunters are particularly noted for their burst damage. Thus with another DPS class by their side, they can pretty much just focus fire and deal massive amounts of damage to a single target. MS warriors are even better for this, as the dual MS debuff makes it particularly easy to focus fire someone.
Now it's been my personal experience that I work well with a Warlock buddy of mine. We have immense CC against healer/DPS teams. (fearbombs + traps) He is SL/SL (last I checked) and so can last a loooong time.
The thing that usually screws us up is when I get focused on as the primary target. (Again, if I'm kiting something around, I'm not maximizing DPS, and I can't kite forever.) To counter this, my partner usually charges in first, and I give him a 5 count before following.
If it's a dual DPS team, we usually CC the biggest threat and quickly focus fire the other one down. If it's a healer/DPS team, we CC the healer, and drop the DPS. Keep in mind that our team isn't foolproof. (We usually lose to Shadow Priest/Lock)
To be honest, I think our team only works well because we're good friends outside the game, and so we get along and can deal with each other.
That's my 2c on the whole 2v2 deal. Feel free to embrace it, love it, or just look at it skeptically.